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If the internal pf angle of a synchronous motor is 30 degree. Then the quadrature axis component of the armature is?

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If the internal pf angle of a synchronous motor is 30 degree. Then the quadrature axis component of the armature is?

(a) 0.866 pu

(b) 0.5 pu

(c) 1.73 pu

(d) 0

I had been asked this question during an online exam.

My query is from Two Reaction Theory of Salient Pole Machines in portion Synchronous Machines of Electrical Machines

1 Answer

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Correct option is (a) 0.866 pu

Easy explanation: Id = Ia*cosψ = 1*cos(3*0).

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